Automatic switch for secondary batteries



(No Model.)

J. S. SELLON.

AUTOMATIC SWITCH FOR SECONDARY BATTERIES.

No. 378,527. Patented Feb. 28, 1888.

WWI Imam.

PETERS. Phfln-Lilhcguphcr. Washinglvn. D. c

UNITED STATES PATENT OFFICE.

JOHN S. SELLON, OF HATTON GARDENS, COUNTY OF MIDDLESEX, ENG- LAND, ASSIGNOR TO THE ELECTRICAL AOGUMULATOR COMPANY, OF

NEW YORK.

AUTOMATIC SWITCH FOR SECONDARY BATTERIES.

SPECIFICATION forming part of Letters Patent No. 378,527, dated February 28, 1888.

Application filed August 30, 1887. Serial No. 248,258. (No model.) Patented in England January 13, 1883, 110.217; in France June 20, 1883, No.156,156, and in Germany July 17, 1883, No. 27,868.

To aZZ whom it may concern:

Be it known that I, J OHN SOUDAMORE SEL- LON, a subject of the Queen of Great Britain and Ireland, and a resident of Hatton Gardens, in the county of Middlesex, England, have in-' vented certain new and useful Improvements in Automatic Switches for Secondary Batteries, (for which I have obtained Letters Patent in Great Britain, No. 217, dated January 13, 1883; inGermany, No. 27,868, dated July 17, 1883, and in France, No. 156,156,dated June 20,

1883,) of which the following is a specification.

My invention relates to an improvement in automatic switches for secondary batteries. It is designed to prevent the injurious effects due to a return-current from the battery should the current from the dynamo fail or fall too low to be effective.

The invention comprises a polarized electromagnet located in the main circuit operating an electro-magnetic switch to break the charging-circuit whenever the direction of the current flowing therein is changed from its normal polarity.

It consists, also, in combining an alarm, as an electromagnetic vibrating bell, with the said switch, to the end that any variations from the normal conditions may be brought to the attention of the engineer or attendant.

In the drawing, S is a secondary battery charged by dynamo M, connected in the main circuit 3 4.

AA is an electro-magnet operating the polarized armature B, pivoted and free to swing upon E.

D D are fixed contact-points in the local circuit 7 8 9.

K K is an electro-magnet having an armature, A, to which is fixed a bar having notches operates upon a gong, a, to call attention to the changed conditions. The switch-arm P is placed upon stop Q, and is there held by notch 2. The dynamo being in operation and delivering an effective current into the battery, the current passing in main circuit 3 4, including magnet A A, is of a polarity to cause the polarized armature B to take up its position near A. Should the current from dynamo M now become ineffective, or should it drop below a certain point, the battery will deliver an effective current. This will be of opposite polarity, and will cause armature B to immediately reverse its position and make contact with point D, closing the local circuit 7 8 9, energizing magnet K K, which attracts its armature and releases the arm P, which immediately leaves stop Q and breaks the circuit 3 4, thus avoiding any injury to the dynamo. Arm P now makes contact with stop 1", closing the local circuit via 3, P, r, x, bell b, and y. It is thus seen that a reversal in the direction of the effective current breaks the main circuit and sounds an alarm. By moving arm P into notch Z the ringing will be stopped,

WVhat I claim, and desire to secure by Letters Patent, is-

1. The combination of a primary generator of electricity, a secondarybattery to be charged thereby, a switch or circuit-changer consisting of a contact-stop and a pivoted bar normally caught and held in contact therewith against suitable retractile force, and means for releasing said pivoted bar operated by variations in the condition of the battery, substantially as described.

2. The combination of a primary generator of electricity, a secondary battery supplied with electricity therefrom, an electro-magnet operated by variations in the polarity of cur- I rent, an electro-magnet operated by a local circuit controlled by the first-named magnet, a circuit-breaker in the supply-circuit, and an electromagnetic alarm operated by the second magnet.

3. The combination of a secondary battery and a primary generator of electricity in the main circuit, an electro-magnet operated by variations in the polarity of current, a circuitbreaker in the main circuit, and an electromagnetic alarm, both controlled by the firstnamed electromagnet.

4. The combination of a dynamo-electric machine, a secondary battery to be charged thereby, a switch or circuit-changing device operated by variations in the condition of the switch.

Signed at London, in the county of Middlesex, England, this 13th day of August, A. D.

thereby, a switch or circuit-changer operated 1887. by variations in the condition of the battery JOHN S. SELLON. to break the charging-circuit, and a signal or Witnesses:

indicator in a local circuit.

5. The combination of a dynamo-electric machine, a secondary battery to be charged JOHN NEWTON, WM. JOHN WEEKS.

Both of 9 Birchin Lane, London.

battery, and a signal or alarm operated by said I 5 

